Sig Sauer ROMEO 4T-PRO Red Dot Sight is a tactical battery powered red dot sight designed, built and tested for hard, professional use. Designed for modern semi-auto pistols, MSR platforms and shotguns Short and medium range engagements and recreational shooting across a wide range of calibers and light conditions. Designed, built and tested for hard, professional use Engineered lens coatings for elite performance in bright light or NV Top mounted activation with NV Override control Quad Ballistic Circle Dot Durable half-inch hex mount 9 Daytime settings, 3 NV settings 3 mounting heights come standard in the box Includes clear flip-backs, opaque front flip back, and ARD Kill-Flash 50,000 hr runtime with CR2032 Battery and MOTAC Assembled in USA